code works in input but not when in a script

Question

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i have a section of coding that works fine when i type it in directly but reports errors and never finishes running when in a script. the section in the script is

        c=Z(1,c2); 
        syms x
        sl1 = solve (cosh(x/(2*c)-(3*c)^2+5)==x);
        SOL(1,c2)= sl1 ;
        c2=c2+1;

it reports a problem with the line 'd = solve...' and errors within the solve command. i cant figure out whats wrong with it as when i type it in the main matlab command line it works fine. the exact errors are

In mupadengine/feval (line 150)
          [S,err] = evalin(engine,stmt);
In solve (line 170)
sol = eng.feval('symobj::solvefull',eqns,vars);
In Untitled (line 9)
      d = solve (tanh(x/(2*b))==x);